Dynamical scaling properties of nanoporous undoped and Sb-doped SnO2 supported thin films during tri- and bidimensional structure coarsening

dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.authorRizzato, A. P.
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.authorCraievich, A. F.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:20:29Z
dc.date.available2014-05-20T15:20:29Z
dc.date.issued2007-05-01
dc.description.abstractThe coarsening of the nanoporous structure developed in undoped and 3% Sb-doped SnO2 sol-gel dip-coated films deposited on a mica substrate was studied by time-resolved small-angle x-ray scattering (SAXS) during in situ isothermal treatments at 450 and 650 degrees C. The time dependence of the structure function derived from the experimental SAXS data is in reasonable agreement with the predictions of the statistical theory of dynamical scaling, thus suggesting that the coarsening process in the studied nanoporous structures exhibits dynamical self-similar properties. The kinetic exponents of the power time dependence of the characteristic scaling length of undoped SnO2 and 3% Sb-doped SnO2 films are similar (alpha approximate to 0.09), this value being invariant with respect to the firing temperature. In the case of undoped SnO2 films, another kinetic exponent, alpha('), corresponding to the maximum of the structure function was determined to be approximately equal to three times the value of the exponent alpha, as expected for the random tridimensional coarsening process in the dynamical scaling regime. Instead, for 3% Sb-doped SnO2 films fired at 650 degrees C, we have determined that alpha(')approximate to 2 alpha, thus suggesting a bidimensional coarsening of the porous structure. The analyses of the dynamical scaling functions and their asymptotic behavior at high q (q being the modulus of the scattering vector) provided additional evidence for the two-dimensional features of the pore structure of 3% Sb-doped SnO2 films. The presented experimental results support the hypotheses of the validity of the dynamic scaling concept to describe the coarsening process in anisotropic nanoporous systems.en
dc.description.affiliationUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315970 São Paulo, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.format.extent8
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.75.205335
dc.identifier.citationPhysical Review B. College Pk: American Physical Soc, v. 75, n. 20, 8 p., 2007.
dc.identifier.doi10.1103/PhysRevB.75.205335
dc.identifier.fileWOS000246890900092.pdf
dc.identifier.issn1098-0121
dc.identifier.lattes5584298681870865
dc.identifier.lattes9971202585286967
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.urihttp://hdl.handle.net/11449/31771
dc.identifier.wosWOS:000246890900092
dc.language.isoeng
dc.publisherAmerican Physical Soc
dc.relation.ispartofPhysical Review B
dc.relation.ispartofsjr1,604
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleDynamical scaling properties of nanoporous undoped and Sb-doped SnO2 supported thin films during tri- and bidimensional structure coarseningen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmerican Physical Soc
unesp.author.lattes9971202585286967
unesp.author.lattes5584298681870865[1]
unesp.author.orcid0000-0002-8356-8093[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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